Hello!

I'm having an issue with ghcjs and interactive process routines family.

Setup:

Linux kenny 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015 x86_64 GNU/Linux
The Glorious Glasgow Haskell Compilation System for JavaScript, version 0.2.0 (GHC 7.10.3)
The Glorious Glasgow Haskell Compilation System, version 7.10.3
node v5.3.0

Main.hs contents:

import System.Process
import System.IO
main = do
  x <- readProcess "echo" ["123"] []
  print x

Reproduction:

ghcjs Main.hs
node Main.jsexe/all.js

Output:

""

• This example works with ghc - native binary output is "123".
• If I use "touch" instead of "echo", the file "123" is created, so the process launching seems to work.
• It looks like is's some piping that is broken/not implemented(?), because hGetContents seems to be working fine on non-pipe files (should check with the standalone pipes, though, without creating processes...)
• I've found out this in attempts to investigate the failure of ghcjs-boot, when building cabal, when the Setup.hs got build by ghcjs, producing a javascript version of the setup, which was not able to determine ghcjs's version, like this, so my ghcjs-boot failed:

setup: The program 'ghcjs' version >=0.1 is required but the version of
/home/kost/.cabal/bin/ghcjs could not be determined.

Can anyone else reproduce?